Cambridge International Mathematics

(Tina Sui) #1
ANSWERS 697

d

epositively skewed fmode=2
2aEmails sent last week Tally Frequency
0 - 9 ©©jjjjj 6
10 - 19 ©©jjjjjjjj 9
20 - 29 ©©jjjjjj 7
30 - 39 ©©jjjj 5
40 - 49 jj 2
50 - 59 j 1
Total 30
b

c 10 - 19 emails d 26 :7% e positively skewed
3a 10 days b 27 :5% c 170 - 179 vehicles dx¼ 169
4 ¼ 13 : 6 56 , x=2
6amedian= 101: 5 ,Q 1 =98,Q 3 = 105: 5
bIQR=7: 5. The middle50%of the data lies in an interval
of length 7 : 5
7ax¼ 52 : 3 b 51 cQ 1 =42
dQ 3 =61 e 32 fIQR=19
8a ix¼ 8 : 47 ii 9 iii 9 iv 4
bwell above the average cnegative
9 x¼ 7 : 58 , median¼ 6 : 90
10 a i x¼ 371 ii 372 iii 228 : 5 iv 469 : 5
brange= 682, IQR= 241
EXERCISE 14A
1ahorizontal line bvertical line

cvertical line dhorizontal line

2ahorizontal line bvertical line

3ay=0 b x=0 cy=¡ 3 d x=4
4ay=3 b x=4
EXERCISE 14B
1a ix ¡^3 ¡^2 ¡^10123
y ¡ 3 ¡ 2 ¡ 10123
ii

iii gradient=1, x- andy-intercepts are both 0
bix ¡^3 ¡^2 ¡^10123
y ¡ 9 ¡ 6 ¡ 30369
ii iii gradient=3,
x- andy-intercepts
are both 0

cix ¡^3 ¡^2 ¡^10123
y ¡ 1 ¡^23 ¡^13013231
ii

iii gradient=^13 , x- andy-intercepts are both 0
dix ¡^3 ¡^2 ¡^10123
y 9630 ¡ 3 ¡ 6 ¡ 9
ii iii gradient=¡ 3 ,
x- andy-intercepts
are both 0

0

2

4

6

8

012345678

no. of
children

frequency

Number of children in a household

0

2

4

6

8

10

0 102030405060

emails
sent/week

frequency

Emails data

y

x

6 y¡=¡6

O

y

-3 x

x¡=¡-3

O

y

x

-4 y¡=¡-4

O

y

x

2

x¡=¡2

O

3

3

6

-3
-3

-6

-6 6

x

y
yx¡=¡

O

-9

-6

-3

3

6

9

-3 3

y

x

yx¡=¡3

O

-2

2
-2
2

y

x

yx¡=¡Qe_\
O

-9

-6

-3

3

6

9

-3 3

y

x

yx¡=¡-3

O

scores.

IB MYP_3 ANS
cyan magenta yellow black

(^05255075950525507595)
100 100
(^05255075950525507595)
100 100
Y:\HAESE\IGCSE01\IG01_an\697IB_IGC1_an.CDR Thursday, 20 November 2008 4:11:38 PM PETER

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